I think it's just a bad node your connected to. Get a new node and try again? Took about the normal amount of time for me.
What browser are you using (I'm using firefox for tor and it works fine). Just click the dropdown menu and click "new tor circuit for this site".
I see what I've been doing differently now. I've been pressing new identity each time and it looks like I have just been unlucky and keep getting banned nodes. After hitting new tor circuit for the site I login within a few attempts and have tested this before the other day and today. Thanks for that.